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40 <br />s <br />risk related to dam/levee failure is flooding due to <br />substantial rainfall and its eastward migration to final <br />discharge in the Indian River Lagoon. Structural and <br />non-structural techniques to slow and contain this <br />runoff incorporate several drainage systems, some <br />dating back to 1919. Rainfall in excess of designed <br />capacities could cause erosion of constructed <br />drainage facilities and flooding of many areas <br />including primary roadway evacuation routes. <br />2) Earthquakes <br />Although Florida is not usually considered to be a <br />state subject to earthquakes, several minor shocks <br />have occurred over time, but only one caused any <br />damage (Zirbes, 1971). <br />In January 1879, a shock occurred near St. <br />Augustine that is reported to have knocked <br />plaster from walls and articles from shelves. <br />Similar effects were reported in Daytona <br />Beach. The shock was felt in Tampa, <br />throughout central Florida, and in Savannah, <br />Georgia as well (Zirbes, 1971). <br />In January 1880, another earthquake <br />occurred. This time Cuba was the focal point. <br />Shock waves were sent as far north as the <br />town of Key West, Florida (Zirbes, 1971). <br />In August 1886, Charleston, South Carolina <br />was the center of a shock that was felt <br />throughout northern Florida. It rang church <br />bells in St. Augustine and severely jolted other <br />towns along sections of Florida's east coast. <br />Jacksonville residents felt many of the strong <br />after shocks that occurred in September, <br />October, and November, 1886 (Zirbes, 1971). <br />Indian River County Comprehensive Emergency Management Plan Basic Page 25